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1 July 2009 Purification and Classification of Three Lipovitellin Subtypes in the Marbled Sole (Pleuronectes yokohamae)
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An immunological analysis using subtype-specific antisera of the major yolk protein lipovitellin (Lv) of the grey mullet (Mugil cephalus) confirmed the presence of the three corresponding Lv subtypes (LvA, LvB, and LvC) in vitellogenic ovaries of the marbled sole (Pleuronectes yokohamae). These three Lv subtypes were purified from sole ovaries by using various combinations of anion exchange, hydroxylapatite, immunoadsorbent, and gel-filtration chromatography. Purified LvA, LvB, and LvC had an apparent native mass of ∼482, ∼380, and ∼372 kDa, respectively, estimated by gel filtration. Analysis of their tertiary structures by SDS-PAGE indicated that LvA, LvB, and LvC were typical of teleost Lvs in having a heavy (H) chain (∼105, ∼102, and ∼107 kDa, respectively) and a light (L) chain (∼22, ∼19.5, and ∼25 kDa, respectively). The N-terminal amino acid (AA) sequences were obtained for the LvA H chain, the LvB H and L chains, and the LvC L chain and compared to the deduced AA sequences of their precursors, vitellogenins (Vgs), in several species. This comparison of LvA, LvB, and LvC with various teleost VgA, VgB, and VgC sequences, respectively, revealed high identities (60–100%). The purified Lv subtypes were subjected to double immunodiffusion using an antiserum against an unclassified Lv of the sole (Hashimoto et al., 1998); only the LvB subtype exhibited immunoreactivity with this antiserum. This result indicates that the previously developed immunoassay using this anti-Lv for the detection of sole Vg is effectively a VgB-specific assay.

© 2009 Zoological Society of Japan
Haruna Amano, Toshiaki Fujita, Naoshi Hiramatsu, Takashi Todo, and Akihiko Hara "Purification and Classification of Three Lipovitellin Subtypes in the Marbled Sole (Pleuronectes yokohamae)," Zoological Science 26(7), 510-516, (1 July 2009).
Received: 25 December 2008; Accepted: 1 April 2009; Published: 1 July 2009

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